fdesc_vnops.c revision 1.23
1 /* $NetBSD: fdesc_vnops.c,v 1.23 1994/12/14 18:40:27 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)fdesc_vnops.c 8.12 (Berkeley) 8/20/94 39 * 40 * #Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp # 41 */ 42 43 /* 44 * /dev/fd Filesystem 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/types.h> 50 #include <sys/time.h> 51 #include <sys/proc.h> 52 #include <sys/kernel.h> /* boottime */ 53 #include <sys/resourcevar.h> 54 #include <sys/filedesc.h> 55 #include <sys/vnode.h> 56 #include <sys/malloc.h> 57 #include <sys/file.h> 58 #include <sys/stat.h> 59 #include <sys/mount.h> 60 #include <sys/namei.h> 61 #include <sys/buf.h> 62 #include <sys/dirent.h> 63 #include <miscfs/fdesc/fdesc.h> 64 65 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 66 67 #define FDL_WANT 0x01 68 #define FDL_LOCKED 0x02 69 static int fdcache_lock; 70 71 dev_t devctty; 72 73 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 74 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 75 #endif 76 77 #define NFDCACHE 4 78 79 #define FD_NHASH(ix) \ 80 (&fdhashtbl[(ix) & fdhash]) 81 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; 82 u_long fdhash; 83 84 /* 85 * Initialise cache headers 86 */ 87 fdesc_init() 88 { 89 90 devctty = makedev(nchrdev, 0); 91 fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash); 92 } 93 94 int 95 fdesc_allocvp(ftype, ix, mp, vpp) 96 fdntype ftype; 97 int ix; 98 struct mount *mp; 99 struct vnode **vpp; 100 { 101 struct fdhashhead *fc; 102 struct fdescnode *fd; 103 int error = 0; 104 105 fc = FD_NHASH(ix); 106 loop: 107 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) { 108 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 109 if (vget(fd->fd_vnode, 0)) 110 goto loop; 111 *vpp = fd->fd_vnode; 112 return (error); 113 } 114 } 115 116 /* 117 * otherwise lock the array while we call getnewvnode 118 * since that can block. 119 */ 120 if (fdcache_lock & FDL_LOCKED) { 121 fdcache_lock |= FDL_WANT; 122 sleep((caddr_t) &fdcache_lock, PINOD); 123 goto loop; 124 } 125 fdcache_lock |= FDL_LOCKED; 126 127 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 128 if (error) 129 goto out; 130 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK); 131 (*vpp)->v_data = fd; 132 fd->fd_vnode = *vpp; 133 fd->fd_type = ftype; 134 fd->fd_fd = -1; 135 fd->fd_link = 0; 136 fd->fd_ix = ix; 137 LIST_INSERT_HEAD(fc, fd, fd_hash); 138 139 out:; 140 fdcache_lock &= ~FDL_LOCKED; 141 142 if (fdcache_lock & FDL_WANT) { 143 fdcache_lock &= ~FDL_WANT; 144 wakeup((caddr_t) &fdcache_lock); 145 } 146 147 return (error); 148 } 149 150 /* 151 * vp is the current namei directory 152 * ndp is the name to locate in that directory... 153 */ 154 int 155 fdesc_lookup(ap) 156 struct vop_lookup_args /* { 157 struct vnode * a_dvp; 158 struct vnode ** a_vpp; 159 struct componentname * a_cnp; 160 } */ *ap; 161 { 162 struct vnode **vpp = ap->a_vpp; 163 struct vnode *dvp = ap->a_dvp; 164 char *pname; 165 struct proc *p; 166 int nfiles; 167 unsigned fd; 168 int error; 169 struct vnode *fvp; 170 char *ln; 171 172 pname = ap->a_cnp->cn_nameptr; 173 if (ap->a_cnp->cn_namelen == 1 && *pname == '.') { 174 *vpp = dvp; 175 VREF(dvp); 176 VOP_LOCK(dvp); 177 return (0); 178 } 179 180 p = ap->a_cnp->cn_proc; 181 nfiles = p->p_fd->fd_nfiles; 182 183 switch (VTOFDESC(dvp)->fd_type) { 184 default: 185 case Flink: 186 case Fdesc: 187 case Fctty: 188 error = ENOTDIR; 189 goto bad; 190 191 case Froot: 192 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "fd", 2) == 0) { 193 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 194 if (error) 195 goto bad; 196 *vpp = fvp; 197 fvp->v_type = VDIR; 198 VOP_LOCK(fvp); 199 return (0); 200 } 201 202 if (ap->a_cnp->cn_namelen == 3 && bcmp(pname, "tty", 3) == 0) { 203 struct vnode *ttyvp = cttyvp(p); 204 if (ttyvp == NULL) { 205 error = ENXIO; 206 goto bad; 207 } 208 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 209 if (error) 210 goto bad; 211 *vpp = fvp; 212 fvp->v_type = VFIFO; 213 VOP_LOCK(fvp); 214 return (0); 215 } 216 217 ln = 0; 218 switch (ap->a_cnp->cn_namelen) { 219 case 5: 220 if (bcmp(pname, "stdin", 5) == 0) { 221 ln = "fd/0"; 222 fd = FD_STDIN; 223 } 224 break; 225 case 6: 226 if (bcmp(pname, "stdout", 6) == 0) { 227 ln = "fd/1"; 228 fd = FD_STDOUT; 229 } else 230 if (bcmp(pname, "stderr", 6) == 0) { 231 ln = "fd/2"; 232 fd = FD_STDERR; 233 } 234 break; 235 } 236 237 if (ln) { 238 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 239 if (error) 240 goto bad; 241 VTOFDESC(fvp)->fd_link = ln; 242 *vpp = fvp; 243 fvp->v_type = VLNK; 244 VOP_LOCK(fvp); 245 return (0); 246 } else { 247 error = ENOENT; 248 goto bad; 249 } 250 251 /* FALL THROUGH */ 252 253 case Fdevfd: 254 if (ap->a_cnp->cn_namelen == 2 && bcmp(pname, "..", 2) == 0) { 255 error = fdesc_root(dvp->v_mount, vpp); 256 return (error); 257 } 258 259 fd = 0; 260 while (*pname >= '0' && *pname <= '9') { 261 fd = 10 * fd + *pname++ - '0'; 262 if (fd >= nfiles) 263 break; 264 } 265 266 if (*pname != '\0') { 267 error = ENOENT; 268 goto bad; 269 } 270 271 if (fd >= nfiles || p->p_fd->fd_ofiles[fd] == NULL) { 272 error = EBADF; 273 goto bad; 274 } 275 276 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 277 if (error) 278 goto bad; 279 VTOFDESC(fvp)->fd_fd = fd; 280 *vpp = fvp; 281 return (0); 282 } 283 284 bad:; 285 *vpp = NULL; 286 return (error); 287 } 288 289 int 290 fdesc_open(ap) 291 struct vop_open_args /* { 292 struct vnode *a_vp; 293 int a_mode; 294 struct ucred *a_cred; 295 struct proc *a_p; 296 struct file *a_fp; 297 } */ *ap; 298 { 299 struct vnode *vp = ap->a_vp; 300 301 switch (VTOFDESC(vp)->fd_type) { 302 case Fdesc: 303 /* 304 * XXX Kludge: set p->p_dupfd to contain the value of the 305 * the file descriptor being sought for duplication. The error 306 * return ensures that the vnode for this device will be 307 * released by vn_open. Open will detect this special error and 308 * take the actions in dupfdopen. Other callers of vn_open or 309 * VOP_OPEN will simply report the error. 310 */ 311 ap->a_p->p_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 312 return (ENODEV); 313 314 case Fctty: 315 return (cttyopen(devctty, ap->a_mode, 0, ap->a_p)); 316 } 317 318 return (0); 319 } 320 321 static int 322 fdesc_attr(fd, vap, cred, p) 323 int fd; 324 struct vattr *vap; 325 struct ucred *cred; 326 struct proc *p; 327 { 328 struct filedesc *fdp = p->p_fd; 329 struct file *fp; 330 struct stat stb; 331 int error; 332 333 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) 334 return (EBADF); 335 336 switch (fp->f_type) { 337 case DTYPE_VNODE: 338 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, p); 339 if (error == 0 && vap->va_type == VDIR) { 340 /* 341 * directories can cause loops in the namespace, 342 * so turn off the 'x' bits to avoid trouble. 343 */ 344 vap->va_mode &= ~((VEXEC)|(VEXEC>>3)|(VEXEC>>6)); 345 } 346 break; 347 348 case DTYPE_SOCKET: 349 error = soo_stat((struct socket *)fp->f_data, &stb); 350 if (error == 0) { 351 vattr_null(vap); 352 vap->va_type = VSOCK; 353 vap->va_mode = stb.st_mode; 354 vap->va_nlink = stb.st_nlink; 355 vap->va_uid = stb.st_uid; 356 vap->va_gid = stb.st_gid; 357 vap->va_fsid = stb.st_dev; 358 vap->va_fileid = stb.st_ino; 359 vap->va_size = stb.st_size; 360 vap->va_blocksize = stb.st_blksize; 361 vap->va_atime = stb.st_atimespec; 362 vap->va_mtime = stb.st_mtimespec; 363 vap->va_ctime = stb.st_ctimespec; 364 vap->va_gen = stb.st_gen; 365 vap->va_flags = stb.st_flags; 366 vap->va_rdev = stb.st_rdev; 367 vap->va_bytes = stb.st_blocks * stb.st_blksize; 368 } 369 break; 370 371 default: 372 panic("fdesc attr"); 373 break; 374 } 375 376 return (error); 377 } 378 379 int 380 fdesc_getattr(ap) 381 struct vop_getattr_args /* { 382 struct vnode *a_vp; 383 struct vattr *a_vap; 384 struct ucred *a_cred; 385 struct proc *a_p; 386 } */ *ap; 387 { 388 struct vnode *vp = ap->a_vp; 389 struct vattr *vap = ap->a_vap; 390 unsigned fd; 391 int error = 0; 392 393 switch (VTOFDESC(vp)->fd_type) { 394 case Froot: 395 case Fdevfd: 396 case Flink: 397 case Fctty: 398 bzero((caddr_t) vap, sizeof(*vap)); 399 vattr_null(vap); 400 vap->va_fileid = VTOFDESC(vp)->fd_ix; 401 402 switch (VTOFDESC(vp)->fd_type) { 403 case Flink: 404 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 405 vap->va_type = VLNK; 406 vap->va_nlink = 1; 407 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 408 break; 409 410 case Fctty: 411 vap->va_mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; 412 vap->va_type = VFIFO; 413 vap->va_nlink = 1; 414 vap->va_size = 0; 415 break; 416 417 default: 418 vap->va_mode = S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 419 vap->va_type = VDIR; 420 vap->va_nlink = 2; 421 vap->va_size = DEV_BSIZE; 422 break; 423 } 424 vap->va_uid = 0; 425 vap->va_gid = 0; 426 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 427 vap->va_blocksize = DEV_BSIZE; 428 vap->va_atime.ts_sec = boottime.tv_sec; 429 vap->va_atime.ts_nsec = 0; 430 vap->va_mtime = vap->va_atime; 431 vap->va_ctime = vap->va_mtime; 432 vap->va_gen = 0; 433 vap->va_flags = 0; 434 vap->va_rdev = 0; 435 vap->va_bytes = 0; 436 break; 437 438 case Fdesc: 439 fd = VTOFDESC(vp)->fd_fd; 440 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_p); 441 break; 442 443 default: 444 panic("fdesc_getattr"); 445 break; 446 } 447 448 if (error == 0) 449 vp->v_type = vap->va_type; 450 451 return (error); 452 } 453 454 int 455 fdesc_setattr(ap) 456 struct vop_setattr_args /* { 457 struct vnode *a_vp; 458 struct vattr *a_vap; 459 struct ucred *a_cred; 460 struct proc *a_p; 461 } */ *ap; 462 { 463 struct filedesc *fdp = ap->a_p->p_fd; 464 struct file *fp; 465 unsigned fd; 466 int error; 467 468 /* 469 * Can't mess with the root vnode 470 */ 471 switch (VTOFDESC(ap->a_vp)->fd_type) { 472 case Fdesc: 473 break; 474 475 case Fctty: 476 return (0); 477 478 default: 479 return (EACCES); 480 } 481 482 fd = VTOFDESC(ap->a_vp)->fd_fd; 483 if (fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) { 484 return (EBADF); 485 } 486 487 /* 488 * Can setattr the underlying vnode, but not sockets! 489 */ 490 switch (fp->f_type) { 491 case DTYPE_VNODE: 492 error = VOP_SETATTR((struct vnode *) fp->f_data, ap->a_vap, ap->a_cred, ap->a_p); 493 break; 494 495 case DTYPE_SOCKET: 496 error = 0; 497 break; 498 499 default: 500 panic("fdesc setattr"); 501 break; 502 } 503 504 return (error); 505 } 506 507 #define UIO_MX 16 508 509 static struct dirtmp { 510 u_long d_fileno; 511 u_short d_reclen; 512 u_short d_namlen; 513 char d_name[8]; 514 } rootent[] = { 515 { FD_DEVFD, UIO_MX, 2, "fd" }, 516 { FD_STDIN, UIO_MX, 5, "stdin" }, 517 { FD_STDOUT, UIO_MX, 6, "stdout" }, 518 { FD_STDERR, UIO_MX, 6, "stderr" }, 519 { FD_CTTY, UIO_MX, 3, "tty" }, 520 { 0 } 521 }; 522 523 int 524 fdesc_readdir(ap) 525 struct vop_readdir_args /* { 526 struct vnode *a_vp; 527 struct uio *a_uio; 528 struct ucred *a_cred; 529 int *a_eofflag; 530 u_long *a_cookies; 531 int a_ncookies; 532 } */ *ap; 533 { 534 struct uio *uio = ap->a_uio; 535 struct filedesc *fdp; 536 int i; 537 int error; 538 539 /* 540 * We don't allow exporting fdesc mounts, and currently local 541 * requests do not need cookies. 542 */ 543 if (ap->a_ncookies) 544 panic("fdesc_readdir: not hungry"); 545 546 switch (VTOFDESC(ap->a_vp)->fd_type) { 547 case Fctty: 548 return (0); 549 550 case Fdesc: 551 return (ENOTDIR); 552 553 default: 554 break; 555 } 556 557 fdp = uio->uio_procp->p_fd; 558 559 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 560 struct dirent d; 561 struct dirent *dp = &d; 562 struct dirtmp *dt; 563 564 i = uio->uio_offset / UIO_MX; 565 error = 0; 566 567 while (uio->uio_resid > 0) { 568 dt = &rootent[i]; 569 if (dt->d_fileno == 0) { 570 /**eofflagp = 1;*/ 571 break; 572 } 573 i++; 574 575 switch (dt->d_fileno) { 576 case FD_CTTY: 577 if (cttyvp(uio->uio_procp) == NULL) 578 continue; 579 break; 580 581 case FD_STDIN: 582 case FD_STDOUT: 583 case FD_STDERR: 584 if ((dt->d_fileno-FD_STDIN) >= fdp->fd_nfiles) 585 continue; 586 if (fdp->fd_ofiles[dt->d_fileno-FD_STDIN] == NULL) 587 continue; 588 break; 589 } 590 bzero((caddr_t) dp, UIO_MX); 591 dp->d_fileno = dt->d_fileno; 592 dp->d_namlen = dt->d_namlen; 593 dp->d_type = DT_UNKNOWN; 594 dp->d_reclen = dt->d_reclen; 595 bcopy(dt->d_name, dp->d_name, dp->d_namlen+1); 596 error = uiomove((caddr_t) dp, UIO_MX, uio); 597 if (error) 598 break; 599 } 600 uio->uio_offset = i * UIO_MX; 601 return (error); 602 } 603 604 i = uio->uio_offset / UIO_MX; 605 error = 0; 606 while (uio->uio_resid > 0) { 607 if (i >= fdp->fd_nfiles) 608 break; 609 610 if (fdp->fd_ofiles[i] != NULL) { 611 struct dirent d; 612 struct dirent *dp = &d; 613 614 bzero((caddr_t) dp, UIO_MX); 615 616 dp->d_namlen = sprintf(dp->d_name, "%d", i); 617 dp->d_reclen = UIO_MX; 618 dp->d_type = DT_UNKNOWN; 619 dp->d_fileno = i + FD_STDIN; 620 /* 621 * And ship to userland 622 */ 623 error = uiomove((caddr_t) dp, UIO_MX, uio); 624 if (error) 625 break; 626 } 627 i++; 628 } 629 630 uio->uio_offset = i * UIO_MX; 631 return (error); 632 } 633 634 int 635 fdesc_readlink(ap) 636 struct vop_readlink_args /* { 637 struct vnode *a_vp; 638 struct uio *a_uio; 639 struct ucred *a_cred; 640 } */ *ap; 641 { 642 struct vnode *vp = ap->a_vp; 643 int error; 644 645 if (vp->v_type != VLNK) 646 return (EPERM); 647 648 if (VTOFDESC(vp)->fd_type == Flink) { 649 char *ln = VTOFDESC(vp)->fd_link; 650 error = uiomove(ln, strlen(ln), ap->a_uio); 651 } else { 652 error = EOPNOTSUPP; 653 } 654 655 return (error); 656 } 657 658 int 659 fdesc_read(ap) 660 struct vop_read_args /* { 661 struct vnode *a_vp; 662 struct uio *a_uio; 663 int a_ioflag; 664 struct ucred *a_cred; 665 } */ *ap; 666 { 667 int error = EOPNOTSUPP; 668 669 switch (VTOFDESC(ap->a_vp)->fd_type) { 670 case Fctty: 671 error = cttyread(devctty, ap->a_uio, ap->a_ioflag); 672 break; 673 674 default: 675 error = EOPNOTSUPP; 676 break; 677 } 678 679 return (error); 680 } 681 682 int 683 fdesc_write(ap) 684 struct vop_write_args /* { 685 struct vnode *a_vp; 686 struct uio *a_uio; 687 int a_ioflag; 688 struct ucred *a_cred; 689 } */ *ap; 690 { 691 int error = EOPNOTSUPP; 692 693 switch (VTOFDESC(ap->a_vp)->fd_type) { 694 case Fctty: 695 error = cttywrite(devctty, ap->a_uio, ap->a_ioflag); 696 break; 697 698 default: 699 error = EOPNOTSUPP; 700 break; 701 } 702 703 return (error); 704 } 705 706 int 707 fdesc_ioctl(ap) 708 struct vop_ioctl_args /* { 709 struct vnode *a_vp; 710 u_long a_command; 711 caddr_t a_data; 712 int a_fflag; 713 struct ucred *a_cred; 714 struct proc *a_p; 715 } */ *ap; 716 { 717 int error = EOPNOTSUPP; 718 719 switch (VTOFDESC(ap->a_vp)->fd_type) { 720 case Fctty: 721 error = cttyioctl(devctty, ap->a_command, ap->a_data, 722 ap->a_fflag, ap->a_p); 723 break; 724 725 default: 726 error = EOPNOTSUPP; 727 break; 728 } 729 730 return (error); 731 } 732 733 int 734 fdesc_select(ap) 735 struct vop_select_args /* { 736 struct vnode *a_vp; 737 int a_which; 738 int a_fflags; 739 struct ucred *a_cred; 740 struct proc *a_p; 741 } */ *ap; 742 { 743 int error = EOPNOTSUPP; 744 745 switch (VTOFDESC(ap->a_vp)->fd_type) { 746 case Fctty: 747 error = cttyselect(devctty, ap->a_fflags, ap->a_p); 748 break; 749 750 default: 751 error = EOPNOTSUPP; 752 break; 753 } 754 755 return (error); 756 } 757 758 int 759 fdesc_inactive(ap) 760 struct vop_inactive_args /* { 761 struct vnode *a_vp; 762 } */ *ap; 763 { 764 struct vnode *vp = ap->a_vp; 765 766 /* 767 * Clear out the v_type field to avoid 768 * nasty things happening in vgone(). 769 */ 770 vp->v_type = VNON; 771 return (0); 772 } 773 774 int 775 fdesc_reclaim(ap) 776 struct vop_reclaim_args /* { 777 struct vnode *a_vp; 778 } */ *ap; 779 { 780 struct vnode *vp = ap->a_vp; 781 struct fdescnode *fd = VTOFDESC(vp); 782 783 LIST_REMOVE(fd, fd_hash); 784 FREE(vp->v_data, M_TEMP); 785 vp->v_data = 0; 786 787 return (0); 788 } 789 790 /* 791 * Return POSIX pathconf information applicable to special devices. 792 */ 793 fdesc_pathconf(ap) 794 struct vop_pathconf_args /* { 795 struct vnode *a_vp; 796 int a_name; 797 register_t *a_retval; 798 } */ *ap; 799 { 800 801 switch (ap->a_name) { 802 case _PC_LINK_MAX: 803 *ap->a_retval = LINK_MAX; 804 return (0); 805 case _PC_MAX_CANON: 806 *ap->a_retval = MAX_CANON; 807 return (0); 808 case _PC_MAX_INPUT: 809 *ap->a_retval = MAX_INPUT; 810 return (0); 811 case _PC_PIPE_BUF: 812 *ap->a_retval = PIPE_BUF; 813 return (0); 814 case _PC_CHOWN_RESTRICTED: 815 *ap->a_retval = 1; 816 return (0); 817 case _PC_VDISABLE: 818 *ap->a_retval = _POSIX_VDISABLE; 819 return (0); 820 default: 821 return (EINVAL); 822 } 823 /* NOTREACHED */ 824 } 825 826 /* 827 * Print out the contents of a /dev/fd vnode. 828 */ 829 /* ARGSUSED */ 830 int 831 fdesc_print(ap) 832 struct vop_print_args /* { 833 struct vnode *a_vp; 834 } */ *ap; 835 { 836 837 printf("tag VT_NON, fdesc vnode\n"); 838 return (0); 839 } 840 841 /*void*/ 842 int 843 fdesc_vfree(ap) 844 struct vop_vfree_args /* { 845 struct vnode *a_pvp; 846 ino_t a_ino; 847 int a_mode; 848 } */ *ap; 849 { 850 851 return (0); 852 } 853 854 /* 855 * /dev/fd vnode unsupported operation 856 */ 857 int 858 fdesc_enotsupp() 859 { 860 861 return (EOPNOTSUPP); 862 } 863 864 /* 865 * /dev/fd "should never get here" operation 866 */ 867 int 868 fdesc_badop() 869 { 870 871 panic("fdesc: bad op"); 872 /* NOTREACHED */ 873 } 874 875 /* 876 * /dev/fd vnode null operation 877 */ 878 int 879 fdesc_nullop() 880 { 881 882 return (0); 883 } 884 885 #define fdesc_create ((int (*) __P((struct vop_create_args *)))fdesc_enotsupp) 886 #define fdesc_mknod ((int (*) __P((struct vop_mknod_args *)))fdesc_enotsupp) 887 #define fdesc_close ((int (*) __P((struct vop_close_args *)))nullop) 888 #define fdesc_access ((int (*) __P((struct vop_access_args *)))nullop) 889 #define fdesc_mmap ((int (*) __P((struct vop_mmap_args *)))fdesc_enotsupp) 890 #define fdesc_fsync ((int (*) __P((struct vop_fsync_args *)))nullop) 891 #define fdesc_seek ((int (*) __P((struct vop_seek_args *)))nullop) 892 #define fdesc_remove ((int (*) __P((struct vop_remove_args *)))fdesc_enotsupp) 893 #define fdesc_link ((int (*) __P((struct vop_link_args *)))fdesc_enotsupp) 894 #define fdesc_rename ((int (*) __P((struct vop_rename_args *)))fdesc_enotsupp) 895 #define fdesc_mkdir ((int (*) __P((struct vop_mkdir_args *)))fdesc_enotsupp) 896 #define fdesc_rmdir ((int (*) __P((struct vop_rmdir_args *)))fdesc_enotsupp) 897 #define fdesc_symlink ((int (*) __P((struct vop_symlink_args *)))fdesc_enotsupp) 898 #define fdesc_abortop ((int (*) __P((struct vop_abortop_args *)))nullop) 899 #define fdesc_lock ((int (*) __P((struct vop_lock_args *)))nullop) 900 #define fdesc_unlock ((int (*) __P((struct vop_unlock_args *)))nullop) 901 #define fdesc_bmap ((int (*) __P((struct vop_bmap_args *)))fdesc_badop) 902 #define fdesc_strategy ((int (*) __P((struct vop_strategy_args *)))fdesc_badop) 903 #define fdesc_islocked ((int (*) __P((struct vop_islocked_args *)))nullop) 904 #define fdesc_advlock ((int (*) __P((struct vop_advlock_args *)))fdesc_enotsupp) 905 #define fdesc_blkatoff \ 906 ((int (*) __P((struct vop_blkatoff_args *)))fdesc_enotsupp) 907 #define fdesc_vget ((int (*) __P((struct vop_vget_args *)))fdesc_enotsupp) 908 #define fdesc_valloc ((int(*) __P(( \ 909 struct vnode *pvp, \ 910 int mode, \ 911 struct ucred *cred, \ 912 struct vnode **vpp))) fdesc_enotsupp) 913 #define fdesc_truncate \ 914 ((int (*) __P((struct vop_truncate_args *)))fdesc_enotsupp) 915 #define fdesc_update ((int (*) __P((struct vop_update_args *)))fdesc_enotsupp) 916 #define fdesc_bwrite ((int (*) __P((struct vop_bwrite_args *)))fdesc_enotsupp) 917 918 int (**fdesc_vnodeop_p)(); 919 struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 920 { &vop_default_desc, vn_default_error }, 921 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 922 { &vop_create_desc, fdesc_create }, /* create */ 923 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 924 { &vop_open_desc, fdesc_open }, /* open */ 925 { &vop_close_desc, fdesc_close }, /* close */ 926 { &vop_access_desc, fdesc_access }, /* access */ 927 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 928 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 929 { &vop_read_desc, fdesc_read }, /* read */ 930 { &vop_write_desc, fdesc_write }, /* write */ 931 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 932 { &vop_select_desc, fdesc_select }, /* select */ 933 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 934 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 935 { &vop_seek_desc, fdesc_seek }, /* seek */ 936 { &vop_remove_desc, fdesc_remove }, /* remove */ 937 { &vop_link_desc, fdesc_link }, /* link */ 938 { &vop_rename_desc, fdesc_rename }, /* rename */ 939 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 940 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 941 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 942 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 943 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 944 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 945 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 946 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 947 { &vop_lock_desc, fdesc_lock }, /* lock */ 948 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 949 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 950 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 951 { &vop_print_desc, fdesc_print }, /* print */ 952 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 953 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 954 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 955 { &vop_blkatoff_desc, fdesc_blkatoff }, /* blkatoff */ 956 { &vop_valloc_desc, fdesc_valloc }, /* valloc */ 957 { &vop_vfree_desc, fdesc_vfree }, /* vfree */ 958 { &vop_truncate_desc, fdesc_truncate }, /* truncate */ 959 { &vop_update_desc, fdesc_update }, /* update */ 960 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 961 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 962 }; 963 struct vnodeopv_desc fdesc_vnodeop_opv_desc = 964 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 965
Indexes created Wed Oct 22 06:10:02 GMT 2025